Improvement in machines for making grindstones



UNITED STATES PATENT OEEIcE.

JOI-IN BALDWIN, JR., OF BEREA, OHIO.

IMPROVEMENT IN MACHINES FOR MAKING GRINDSTONES.

To all whom it may concern:

Be it known that I, JOHN BALDWIN, J r., of Berea, in the county of Cuyahoga and State of Ohio, have invented new and useful Improvements in Machines for Manufacturing Grindstones; and I do hereby declare that the following is a full and complete description of the construction and operation of the same, reference being had to the accompanying drawings, making part of this specification, in which- Figure 1 is a perspective View. Fig. 2 is an end View. Fig. 3 is a side View, and Fig. 4 is a vertical longitudinal section.

Like letters refer to like parts.

The nature of my invention relates to such an arrangement of parts and devices that the dust and fine particles of sand thrown off during the process of turning the stone are drawn or carried away from the operator, and thus allowing him to breathe pure air.

It is well known to those engaged in the business of manufacturing grindstones that in consequence of inhaling the dust for a period of three or four years the strongest constitution will be permanently undermined and generally inducing a fatal pulmonary disease.

It will be proper here to state that grindstones are manufactured by taking a slab of stone of the proper thickness and size, usually of the square form, and first mortising a a hole through the center for the introduction of the crank-shaft, commonly called the eye of the stone. In this rough state the stone is secured to the end of a strong shaft or spindle by a nut, which presses it firmly against a face-plate. The shaft and stone being now put in rapid motion by means of a suitable iron tool, the sides and face of the stone are formed as in a turning-lathe.

A is the shaft upon which the block of stone is placed.

B is the face-plate against which the stone is pressed. i

O is the stone in its rough state.

D is the nut that'holds the stone in place upon the shaft A. I

E is a rest attached to the frame by the pin F and which can be swung around in order to put the rough block upon the shaft and remove the stone when completed.

G is a conical-like box that incloses the stone, leaving but a small opening at H H for introducing the iron tool in forming the stone.

I is a door, which forms the lower part of the front of the conical box G and which is attached by hinges I and opens upward horizontally for the purpose of introducing and removing the stone C.

K is a fan-wheel shaft, which is put rapidly in motion by a belt from the pulley A to the pulley K.

L is a fan upon the shaft K. This fan is inclosed in the chamber M, which has a discharge-pipe terminating at any convenient point outside of the inclosure where the machine is situated.

Now, when the stone is put in motion and the tool applied, a cloud of dust is thrown 0E, which, under ordinary circumstances, surrounds the operator, more or less of which he is forced to inhale; but with the devices and arrangements herein described a current of air is established upward through the cone G, fan-chamber M, and discharge-pipe N. The space below the rest E being inclosed, the incoming current of air must necessarily be through the openings H H', and consequently the dust is all drawn off and discharged at a point harmless to the operator. This discharge. may be in any direction, and the fan may be situated either horizontal to or below the stone without in .any way changing the nature of the invention.

I do not claim, broadly, a lathe for manufacturing grindstones; but

What I do claim as my improvement, and desire to secure by Letters Patent, is-

The inclosure G, fan L, chamber M, and

discharge-pipe N, when these parts are arranged as described and used in combination with a machine for forming grindstones and operating as and for the purpose herein set forth.

JN0. BALDWIN, JR.

Witnesses:

J. BRAINERD,

S. H. MATHER. 

